On Thu, 2010-08-19 at 16:06 -0700, David VomLehn wrote:
> On Thu, Aug 19, 2010 at 09:04:21PM +0530, naveen yadav wrote:
> > Dear all,
> > I build MIPS 32 with sparsemem support to take care of holes in
> > physical memory, this conserve memory but put overhead to speed
> > because of pointer redirection in pfn_to_page().
> > To prevent this conversion I tried to use
> > CONFIG_SPARSEMEM_VMEMMAP_ENABLE on MIPS 32 but kernel build fails
> > becauase most of the supported functions related to vmemmap are
> > supported for 64 bit architectures only.
> > I wish to compare memory and speed result with / without
> > CONFIG_SPARSEMEM_VMEMMAP_ENABLE in MIPS 32. I need your comment in it
> > ?
> We use sparse memory and submitted a patch some while ago to add support,
> but it died for lack of interest. The patch was relative to a kernel
> from several released ago; I don't know whether it would apply to
> the tip. I can see if I track it down.
I keep thinking we should have a git tree for highmem 'experimental'
changes. Some of us are shipping highmem, discontiguous memory systems
in high volume.